The study also included interviews with 50 people who either
owned a memory-foam mattress or "had experienced intimacy" on
one.

Those who had done the latter described it as "uncomfortable,"
"difficult," and feeling as if they were "stuck in quicksand."
They often opted to have sex less frequently, or would choose a
different household location instead of their foam mattress, the
mattress maker found.

The Hybrid also won in the sleep category as well, but who cares
— sex sells.